The correct response is the height of the object.
Gravitational potential energy (GPE) is calculated using the formula:
\[ \text{GPE} = mgh \]
where \( m \) is the mass of the object, \( g \) is the gravitational field strength, and \( h \) is the height of the object above a reference point. The shape, velocity, and temperature of the object do not directly affect its gravitational potential energy.